What is this feeling?

So I’ve been having cramps throughout my entire pregnancy but as I get further along I’ve realized I only get cramps while running around at work, sometimes carrying things or when my bf and I will play fight and such. It is just a cramping feeling right where baby is. Is it maybe cause baby is bouncing around so much in there or because I’m over exerting myself? When I went to the doctor baby was bouncing around like crazy, we almost didn’t get a pic of him 😂 I’m 11w5d btw